As a technologist, I like the proposal to use HTTP header to convey a preference. With any proposals, there will be people who have other ideas. I wonder first who made the decision, how did he communicate the process, and finally made the call.
MEDIA DECODER BLOG: Google and Mozilla Announce New Privacy Features
Mozilla and Google said that they plan to provide browser features that will allow users to opt-out of being tracked by third-party advertisers online.